Apparatus for inside riveting of hollow rivets



April 17, 1945. 'AL cuccHi ETAL APPARATUS FOR INSIDE RIVETING OF HOLLOW RIVETS Filed April 17, 1939 2 Sheets-Sheet 1 April 17, 1945. A. cuccHl r-:rAL

APPARATUS FOR INSIDE RIVETING` OF HOLLOW RIVETS 2 sheets-sheetn 2 Filed April 17, 1939 v/llllll/l/ll/lll,

'IIII i;

l wheel. Namely:

j Fig; 1 isfa vertical section through a rivetland o Patented Apr. 17., 1945 p UNITED STATES PATENT- i oFFlcE i. A evaovaf` APPARATUS Foa INSIDE *RIVETING or V p 1 rronLowRIvEfrsv Adamo Cucchi and2Giuseppe Manzini, Sesto I Giovanni, Milan, Italy; vested yin tlie Alien Property vCustodian Application April 1i, 19am-seria;

No. 268,414 y 1n any April-27, 193s f y sci-aims. (entrai-is) I *The invention relates to devices for applying rivets and more particularly for forming rivet connections between bodies, one of which-may be hollow and inaccessible. v

The invention solves the problem in the sim# beading operation it revolves around its axisso -f as to operate gradually over the whole periphery of the bush;l

IBut in--another embodiment oi the invention,

one might just provide pressure,'always accompanied Yby the characteristic rotation, automatic v'or non-automatic, so that the rivet endmay-be 4ilared gradually and upset against the inner fwall..

The -lnvention will now be disclosed with rer- 'eren'ce to the attached drawings, given solely'as example of an-embodiment, hunting in no way the range of the invention. 1 YIn the drawings, the rst two iigures are'given justto explain the method, whilst the remaining Afigures show an embodiment of a hand apparatus, .based on the beadingfaction of a hammer usinga-spring drive and with angular automatic displacements obtained step tostep by` a ratchet cooperating tool portions, showing'fthe riveting `actionobtained Within an inaccessible chamber; '1 Fig.`-2 is a plan view of the same with the upper portion of the chamber omitted. f

' Fig. 3 -is-a perspective view of the tool for per: Y "35 forming the riveting; l

Fig.-' 4is a vertical sectionthroughf'the central portion of the tool, according to Fig. 3. Y Fig.- 5' is a detail vertical section takensubstantially on line 5-5 of Fig. 4; f f

` Figs. 46 andv 7 and 8 are detail cross sections, ltaken respectively along lines 6 6, 1 1, and 8-8 oi` Flg.4; f Fig. 9 is a detail vertical section on a' larger scale through the riveting hammer. f f With reference to Figs. 1 and 2: A is the comparatively--inaccessible hollowmember toA b e riv- 'eted to B by means of hollow rivets I0, having an 'axial hole II for permitting passing intoit'the riveting tool or hammer I2 and a guiding bar I3. These lslide within a sleeve IIL-upon which the head I5 of the rivet bears. If ya rotation is` given to the riveting tool around its axis,` combined 'with a reciprocating hammering motion alongthe same axis, the edgeof the hollow'rivet l0 is'beadedorups'et by tln'ehammerv I2 towards the out-k of the rivets."

`side'thereby securing the two members.A In order to start riveting; iirst the riveting hammer I2 isintroduced --in hole 'I'I, the guide-bar I3 having been displaced relatively to the hammer I2. The riveting tool I2 is provided with-alateral projection I2a designed so as tofreely go through hole II-ofvhollow-rivet'l. Theguiding-bar I3 is then-moved to operative .position inthe hole :and riveting is begun. In la reverse order of movementsy the riveting. tool I2 can be removed.

Figs. .3ito` 9 :show an embodiment of the rivetingdevicey "lhishas two handles 20, 20a fixed tothe outer `body. ofthe apparatus. Under one of .saidwihandles' projects.v a' working-levery 2I, whilst under fthe. other handlelis placed a lever 22 for. lifting. thel bar I3 to;` inoperative position. Lever; 2 I., besides. controlling the reciprocating movement of the riveting toolfl2,' provides for its rotation so as.to move. the `hammer to operate 'over the kwhole 4periphery-of -zthe free end of the lhollow rivet.v Besidesfsaid lever is held in raised inoperativeposition as .soon as. the riveting actionxis. terminated, namely,.ivhen vthe 'riveting hammer VI 2 has completed*;afrevo1ution and is also :combined with ymeansgiior adjusting the stroke vof-the tool-I2, accodingzto ,thelength of the rivetand thethicknessbrthe articles to be united, Lever `2| is fulcrumedat 23 (Figs. 4 and 6) and has ,two hinged arms 124, lpressed toward each other by Springs 25, which tend to, keep said .arms engaged in an annular?, groove cutin the tube 21..iust above the iiangem26. Tube 21 encloses the rivetinghammer. and its guide-bar I3.

threaded steml 30 sliding in a stationary collar '31| andcooperatingwith a screw 32 provided with an adiusting knob .33 `projecting outside of the casing.y Orr they threadedy stem 30` is iixed an indizi:v M ,CQODQratina with a graduated scale on theutside of-thecaslng; the 'setting 0f the index relative'to said scale depending on the thickness of the plates to be united and on the material To lev'r'vZI is pivotedonefendof link 35, l(Fig. 4) the-other end of which is4 pivoted to a lever ibrfulruxned adjacent its upper end, at 31, to the of fthe. apparatus `and saidv lever is prorotated by lever 2l through link 35, lever 36 audiV its extension 38, which, -by engaging the ,teeth of the ratchet wheel moves it `th`rd1`igha.prede? ,y

termined angle (herein shown as 60) for each full upward swing of the-llover II,"'thejrnagni-V` tude of swing of lever 2Pdepending"upon the adjustment of Wedge 29. The ratchet-wheel is also pressed upon by a resiliently mounted: brake .e 42 (Fig. 6), which, by pressing against theteetlt-f of said wheel, prevents accidental rotation. ofY the wheel. Lever 22 is fulcrumed at 43 (Fig. 4l to a vdownwardly .extendingnmemberz l(Mlalso operat- :ing as. al'stop' tothe upward ,movement.v of the innerend of'lever 2L. The Alowerenel of a, small link 45 is pivotedon lever. lsubstantially midway of itslengthand: y.Carries 1on1, its. `upper end azpawl 46 which is pressed. downwardly by a spring 41' to .compel the` pawlM` to cooperate with crown 48 of. av sleeve 49. concentric with tube 21..(Fig. 9)` Inside of said sleeve ..49 is tted a bolt 5I) provided'with a head v5 t, which is normallyheld againstthe internal :shoulder 49a of the sleeve 49 by. means of a helical'sprirxg` i2, en lcircling bolt. 56. Bolt 5Ilhas, at its lower end, a projection 53 retaininga 54;which; is presse-d also by spring .52 against. said projection 53. .In sadbolt 50 thereis out fa notclrrorireoeiving the :end 55 of the. bar lfprovide v.with-a. retaining -projection 456 (Fig.l 9); f r

The sleeve 49 is herein shown-as. slidably xed inl a bushing 51:, pressed :toward 'the upper end of tube' 121 by the action offspring 52Jand coaxial vwith. tubev 21; On they mouth of lthisv tube. 21 a A6l cut yin .the innerper'ipheryiftube 21,' being maintainednormally' in'vlthei'upper-en'ds of said grooves by the. action-of spring 55. -Lever-22 is lalsoprovidedfwith'-afsmal-l:roller`65 (Figs. 4f and .7) carriedf-byli'nks 662` and whieh'can engage a fingerV 61lcarried by lever 2'1Ifand move said'flnger awayfrom the tube2. -Sai d`pawl 61 is pressed A inwardly-by a spring Gsandngages-at the completion of' a riveti-ngoperaticn in' aj-notch 6a" (Fig. 9.) in' `tube 21. The notch is at such -aheiglit that, at the end-of a' riveting loperation, iti-is engaged by the-ringer 51 to-pi-'even-t'tl'ie` lever ZI -from-l fully an inclined surface -1 Ilwprovifded on the "lower 'end of a sleeve-'P61- encirclingjthe 'upper' end of Ytube 2.1, soas'to be aispiaedlsterany, the sleeve lIl .being fixed to. the body of theapparatusby a nutlb. Lever 22j carrlesufspaedeatensions 1I (Figs. 4 and rn unit eva crssaberjz, which bar linseste? tes-.e9rerseette.fefk 13 pivoted at 43 and pressed by a spring 14 against the stop bar 12. Said fork 43 is moved under certain conditions, as will be disclosed hereinafter, into the path of a stop 15 (Fig. 6) pivoted at 16 to lever 2I, and normally held in the position shown in Fig. 4 by torsion spring 11. The engagement of the fork 13 with the stop 15 limits the prelimnarymovement of the lever-2l incident to which the tool I2 is inserted in the rivet. The apparatus is completed by a driving spring 18 (Figs. 4 and ,5), encircling tube 21 and by the lower guiding bushing 19, ending in a threaded -respect to the rivet, by means of the operation of-levers 2I and 22. By pressing on the latter as far as it will go and holding it there, the tooth 46 engages crown 48 of bushing 49 and lifts it. The lifting of crown 48 pulls up bushing 49 and the shoulder 49a in turn. pulls up head 5I and rod5ll. The projection 5,3 on rod 50 moves up with rod 5B and in so doing. lifts ring 54 against the. tension of spring 52. The upward movement of rod 5i! lifts the guide bar I3 carried by rod 5.0 and the swing of lever 22 lowers the fork 13 into Ythe path of the stop 15. Then due to clearance provided between the fork 13 and stop `'l5 the riveting tool is partly pushed out and passes through the hole of the rivet. This move.- ment oftool I2 is effected thus: the movement of the lever 2|Y moves the arms 24, and thev rollers28 on said arms abut againstl the ilange 26 .on the tube 21 and moves said tube outwardly through guide bushing. y'I9 against the force of spring 1.8. yDuring such outward movement of tube .21. the spring 5-9 holds the rkm-isl'ntng 58 against-the projection 21an and the projection thereof. ASaid fork is normal-ly held against the cross bar 12l by the spring 14 and is retained in this position while the lever 22 is ,held raised and the lever 2I is subsequently lifted topaz'- tially project the tool i2 as above described. After the tool.v i12 has .been properly inserted lin a, rivet the lever 22- is released and returns to operative pcsition.- In so doing, said lever turns about. the pivot 43 freely while` the fork. 1 3 is heldin-its. position of engagement with the stop 15 until the lever 2I is released and restored to its initial `position whereupon, thepressuree between the elements 15 and. 13 being released. the fork I3 is restored-to a position in. engagement with chetmss par 12 by the tension Gf the spring 14. l The spring llcoacting with the vstop .15 permits movement. of the latter relative; to. the lever .2 I(A toavoid jamming between. the .133l and 15. Lever 2t then wil-lswing reelyA and its arms. 2,4 :will move the tube21, thuscompressf ing the driving spring- Nl.v y I l .lowering sufficiently,l arms 24 engagethe wedse.. 2:8. which. (111215011251 Shape mst/PWN@ .will spread .said arms .apart ihrs. diseene? causes the upsetting of a part of the projecting tail of the rivet. Uponv leverZi being released rolls 2B ride up lalong spring 18 and past iiange 4'26 tothe top thereof and in position. toagain 'depress 'ilange 26. During this upward movev`ment of rolls 28 iinger 61. also movesupwardly, .spring 68 tending to hold it in contact with tube 10 v 21 during suchupward movement. rDuring each :stroke but the last one iinger 61 moves to the top of its stroke, since notch S9 was moved v.out

-ofline with finger 61 by the partial movement of lever \2| incidentl to-inserting tool,.|2V into the L15 rivet. However, upon the completion of the `riveting the notch 69 has returned to a position inlinewith nger 61 and said finger iscaught ,by said notch before it has completed its upward movement. Thisy holds the handle' end of lever l2| inpartially elevated position, thus affording :an indication that the riveting is completed.

l When lever 2| was swung, lever 39 was displaced so that its pivoted end portion 38 is actuated, engaging and imparting av rotary movement to the ratchet Awheel 4I, rotatingwith it the tube 21 to which it is keyed and the parts .y

d2 and'- I3. In`this Way the hook |2a of the rivetingl tool `|2 on successive strokes engages the whole circumference of the rivets tail, without requiring any hand-rotation of the riveting device, and obtaining at each stroke of the lever '2| the upsettingA of 'a new part of the rivet, so that after a number of strokesthe riveting is completed. In the case illustrated, the ratchet wheel 4I having six teeth, the riveting is completed after six strokes. As soon as this is completed the tube 21 reaches such a position in its rotation that nger 61, carried by lever 2|, engages in notch 69, to hold the handle end of the lever 2| in raised position, thereby indicating that the riveting operation is completed and the riveting device is ready to be removed. To do this the operator presses lever 22 and holds it pressed, which besides lifting guide-bar I3 in the manner described above, disengages the finger 61 from the notch |59 by means of roller 65. On pressing the lever 2|, the riveting tool I2 is pushed out partially, as stated above and may then be removed from the rivet, and the cycle of operations described above may be repeated with -another rivet.

Springs 52 and 59, placed inside tube 21, be-y sides maintaining the members acted on thereby in properposition also perform a safety function. Whenever the riveting tool I2 and the guide-bar' I3 should encounter, on being inserted against the pressure of the springs 59 and 52 respectively. Thus, the tools I2 and I3 are protected from breakages in that upon meeting with an obsta-cle they can reenter the tube 21, compressing springs 52 and 59.

It is evident that the replacement of the riveting tool I2, the guide-bar I3 and the sleeve I4,.to fit dierent diameters of rivets, is quite simple. To replace these parts the sleeve I4 is removed and the tube 21 temporarily held against rotative and downward movement with known means. Then the user will press down on bushing 49 with a screw-driver or like tool and turn bushing 49 so that pins 63 are in line with the vertical parts of lbayonet slotsii. rThe springs 52 and 59.wil1 then push the bushing 51 out'of. the tube 21.; ,Thus Athe whole mechanism mounted in' tube 21. maybe Ltaken. out and the riveting ytool i2. with its guidebar I3 can be easilyreplaced.4 Notwithstanding our having specied and illustrated a practical embodimentf the invention,

theconstruction'may vary. It is to be understood, that, in practice,thel design and construction. may vary within the limits of the invention.

Having -now described our inventionand how .the same, is -to be-carried. out, whatwe claim as our invention is:

1..;A.device for flanging hollow rivets comprising a guide member, a riveting tool axially movablein said guide and having a lateral projection adapted to be passed through a-hollowrivetfor engaging and flanging avportionof :the freeredge thereof at each axial movement of the tool toward said edge, means forimparting `successive independent swift hammer-like axial movements `to the tool in the-direction .of the rivet and means controlledfby the first mentioned means to rotate the .tool about its axis between each of said axial movements thereof to render the projection operative upon successive portions of said free edge.

i 2.A device for yhanging hollow rivets comprising a guide member, a riveting. tool axially movablev in .l said guide member and` havingy a lateral projection adapted to be passed through a hollow rivet for engagingand iianging a portion of the free edge thereof at each axial movement of the tool toward said edge, said tool being rotatable in said guide member to render said projection operative upon successive portions of sad'free edge, and means for imparting a swift hammer-like axial movement to the tool in the direction of the rivet, said means including a spring normally urging the tool towards the rivet, and manually controlled trip means for compressing the spring and releasing said tool.

3. A device as claimed in claim 1 characterized in that said movement imparting means includes a spring normally urging the tool ytowards the rivet, and manually controlled trip means for compressing the spring and releasing said tool.

4. A device for flanging hollow rivets comprising a guide member, a riveting tool axially movable in said guide and having a lateral projection for engaging and fianging a portion of the free edge of the rivet at each axial movement of the tool toward said edge, spring means normally urging the tool toward the rivet, a member normally lying adjacent the tool and displaceable relatively thereto, manually controlled trip means for compressing said spring and releasing said tool for actuation under the influence of said spring, and manually controlled means for disf placing the second mentioned member.

i with its ring 54 are repressed into the tube 21 5. A device for iianging hollow rivets comprising a guide member, a riveting tool axially movable in said guide member and having a lateral projection for engaging and fianging a portion of the free edge of the rivet at each axial movement of the tool toward said edge, and means for imparting a swift hammer-like axial movement to the tool in the direction of the rivet, said means including spring means'normally urging the tool in the direction of the rivet, manually operable means engaging the tool for moving the latter in the opposite direction and compressing said spring, and means for disengaging said manually operable means from said tool whereby the latter may perform its working stroke under the influence of said spring.

Y 6. A device for Banging hollow rivetscompris'- :ing aguide member, a riveting tool axially movn the tool in the direction oi! the rivet, said means including spring means normally .urging the tool in the direction of the rivet,- manually operable means engaging the tool for moving the latter in the opposite direction y'andcompressing said spring, means for disengaging said manually operable means from said 'tool whereby thelatter may perform its working stroke under -the 'infiuence of'said 'spring and means for adjusting said disengaging meanswith relation to the manually operable means for varying the lengthof the Working stroke ofthe tool.

'1. Adevice for flanging hollow rivets comprising a guide member, a riveting tool and a carrier therefor axially movable in said guide member, said tool having a lateral projection yfor engaging and flanging a portion of tnefree edge of the rivet at each axial movement, of the tool toward said edge, manually controlled means for imparting a swift hammer-like movement to the tool in the direction ofthe rivet, and means actuated by said manually controlled meansto impart a. rotational movement to the tool ateach axial movement thereof away from said edge to render said projection operative upon successive portions of said freejedge.

8. In a device for .Hanging hollow rivets comprising a guide member, a carrier axially movable in said guide member, a, riveting tool carried by the carrier and having a lateral projection for fianging a portion of the free edge ofthe rivet at each axial movement of the tool toward said edge, spring means normally urging the carrier to move the tool towards the rivet. manually controlled trip means for compressing said spring and subseqnently releasing the carrier, whereby the tool may perform its working stroke under the influence of said spring, means detachably securing said tool in said carrier, a member normally disposed adjacent seid projection and displaoeably mounted in said carrier, spring means enclosed by said carrier and normally retaining said displaceably mounted member in operative position, a sleeve-like member in said carrier forming an abutment lfor said spring means andv removable from said carrier to facilitate removal of said member, and means externally of saidcarrlejr for effecting displacement of said membenwitll relao tion to said tool.

ADAMO cUcoHI. l f G-iUsEPPE MANz n\n 

